Office National D'etudes Et De Recherches Aerospatiales (onera)

Onera (office National D'etudes Et De Recherches Aerospatiales)

Steve Masson

Denis Janiaud

Olivier Le Traon

Jean Guerard

Claude Chartier

Iannis Roland

Olivier Ducloux

An inertial sensor for measuring information relating to rotation in three orthogonal axes, comprising a support and a vibrating sensitive element secured to the support; the sensitive element having a deformable frame and at least two deformable projections which extend in a plane (X-Y); wherein the inertial sensor extends in the same plane; the deformable frame and the at least two deformable projections have a plane of symmetry parallel to the plane; the at least two projections are rectilinear beams which have an approximately square cross section, are not collinear and are preferably approximately orthogonal to one another; each of the deformable beams being connected by only one end to the deformable frame at a location at which the amplitude of the primary vibration mode is at a maximum; and in that the sensor has a device for detecting each of the secondary vibration modes.

Planar structure for a triaxial gyrometer

The Coriolis-effect gyrometer has a tuning fork having two tines, which tuning fork is formed in a plate of piezoelectric crystal and provided with electrodes composed of ribbon conductors supported solely by the faces of the tines parallel to the plate. The drive excitation and drive detection electrodes are connected to an oscillator circuit, and the Coriolis detection electrodes are connected to a detection circuit. For each of the faces parallel to the plate of each of the tines the drive detection ribbon is disposed between the drive excitation ribbon and the Coriolis detection ribbon and is connected to the inverting input of an operational amplifier, the non-inverting input of which is connected to the electric ground, said operational amplifier forming part of the oscillator circuit.

Electrodes and associated electronic circuits for a piezoelectric vibrating gyrometer

Growing community of inventors

Le Plessis Robinson, France

Steve Masson